Screw pumps: characteristics and uses
Screw pumps are positive displacement pumps in which a metal helical rotor rotates inside a stator, also helical, but 180° out of phase, forming a cavity between the two parts, which progress along the shaft without changing volume or shape. This action allows the product to be conveyed without degrading it.
In these pumps, the liquid is conveyed between the screw slots of one, two or three rotors that move axially as the screws rotate and engage. When a single screw is used, it is called an eccentric screw pump or progressing cavity pump.
Twin or triple screw pumps are rotary pumps, with high vacuum power, capable of pumping highly viscous products and generating very high pressures. They are used in the oil and petrochemical industry, according to API standards, and in their sanitary version in difficult food applications.
Advantages of the use of eccentric screw pumps
Screw pumps are widely used in the food industry for transferring viscous fluids with a high content of particles in suspension, such as meat extracts, jam, yoghurt, cream cheese, mayonnaise, tomato sauce, fats, liquid chocolate, etc.
The main advantages of using screw pumps include the following:
They easily transport viscous products.
They have a high suction capacity.
They generate a constant flow, without pulses.
They can transport pieces of fruit and other solids in suspension.
They are easy to maintain and have a high level of hygiene.
They provide uniform and gentle conveying, without affecting the stability of emulsions.
High wear resistance, no abrasion or damage to products.
If you need additional information, or are looking for specific equipment, please call or write through the Foeth contact form.
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